Yahoo mail hacked, now what?

I just received an email from my yahoo address with some advert, plus I can see from the cc line that it was sent to ALL people in my yahoo addressbook. I changed my password immediately, emptied the addressbook, I hope that's enough. Is there something else I should do?
Is there a site I could forward this email to? Or find out how it happened? I scanned my computer a few days ago - av, spybot, the whole works so I don't think it's a keylogger.
I suspect it could be the Facebook Friend finder that is the culprit.

You really should scan your computer using an update antivirus program to see if there is any program that can get your password from yahoo and other sites *** well.

If you don't use an antivirus program try to use Kapersky to do that

http://www.kapersky.com

After download and installing the program let it update its virus database definitions and run a full scan on your computer. If it finds something then you should correct the problem and change ALL of your passwords.

click here: http://yhoo.client.shareholder.com/press...
write ur problem & send to yahoo
goodluck ^_^